CODEWITHSUNDEEP
htmlasp.net-mvc-3custom-attributes
René
René

Reputation: 10100

How to append a custom HTML attribute or CSS class using a .NET data annotation attribute?

I'm using ASP.NET MVC 3 RTM. Is it possible to change the HTML rendered from a View Model, by using an attribute?

Example:

public class Product
{
    [AddHtmlAttribute(Name = "disabled", Value = "disabled")]
    public string Name { get; set; }
}

I want the attribute to be able to change the rendered HTML, that property results in. I know it properly can't be done with an attribute alone. I probably have to hook into the system by implementing an interface, but where should I look?

I know MVC uses the default editor templates, and I've looked at them in the MVC 3 source code, but I haven't been able to figure out if it would be possible to somehow hook into the rendered element and add some attributes. I know the validation system does this, by adding custom HTML attributes to support unobtrusive validation.

I guess I just need a pointer to where I should look, or what interface I should take a look at.

Thank you so much.

Update: I'm using the standard HTML helper Html.EditorFor(model => model.Name) for my fields, and haven't overriden any editor templates. I would really prefer if I didn't have to change or override the default templates.

Upvotes: 4

Views: 2549

Answers (1)

Darin Dimitrov
Darin Dimitrov

Reputation: 1038890

You may checkout the following blog post which illustrates how to achieve this by writing a custom DataAnnotationsModelMetadataProvider, attribute and overriding the default templates.

Upvotes: 5

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